Annular stamp-mill



Patented Mar. l4, I899.

F.' L. PRESTON.

ANNULAR STAMP MILL.

(Application filed Aug. 18, 1896.)

2 Sheets$heet 'l'.

N0 Modal.)

w m H M m ml w V v I WITNESSES cffiw No. 620,962. Patented Mar. l4,I899. F. L. PRESTON. ANNULAR STAMP MILL.

(Apphcat onfll dAug 18 1896) 2 Sheets$heet 2'.

(No Model.)

721k ATTOR/VEK? UNITED STATES PATE T Ounce.

FREDERICK L. PRESTON, BELOIT, WVISCONSIN;

ANNULAR STAMP-MILL.

SPECIFICATION forming part of Letters Patent No. 620,962, dated March14., 189?). Application filed August 13, 1896. Serial No. 602,629; (Nomodel.)

To all whom it may concern:

Be it known that I, FREDERICK L. PRES- TON, a resident of the city ofBeloit, in the county of Rock and State of Wisconsin, have inventedcertain new and useful Improvements in Annular Stamp-Mills; and Ido hereby declare that the following is a full, clear, and exact descriptionthereof, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of thisspecification.

This invention relates to improvements in stamp-mills for the crushingof ores, and particularly to that class of ore stamps or batteries ofthe annular or circular description and provided with frames in whichthe stampstems are supported and guided and in which they are arrangedannularly. In batteries of this class the stamps are lifted by therevolving action of a cam or cams, which engage the under side of asuitable tappet upon the stamp-stem, and at a proper time the tappetdrops from the cam, and thus the stamps are successively raised anddropped. In machines of this class the cam or cams are horizontallyarranged and the load or the lifting of the stamps is vertical.Consequently it is desirable to provide antifriction-bearings whereverpossible.

My invention therefore consists, first, in providing the movable partsof an annular stamp-mill with my improved antifrictionbearing.

The invention consists, second, in the various devices and combinationsof devices hereinafter described, and which will be more particularlypointed out in the claims.

The object of the invention is to provide an improved stamp-mill for thetrituration, stamping, and pulverizing of rocks and ores which shall atthe same time be simple, cheap, and durable in construction, effectivein operation, not liable to get out of repair, and which will requirethe minimum amount of power for its operation.

With these objects in view I now'proceed to describe the drawingsaccompanying this specification.

Figure 1 illustrates an exterior elevation of a stamp-mill embodying myinvention. Fig. 2 is a central vertical sectional View of the same,showing, however, but two stampstems, one raised and the other down.

Fig. 3 is a vertical sectional view of the upper plate. Fig. 4 is asectional view showing one of the vertical or curved liftingcamsdetached. Fig. 5 is a vertical sectional view of the double-flangedlower plate of the machine-frame. Fig. 6 is a vertical sectional view ofthe wheel with conical hub, to which the liftingmams are secured. Fig. 7is asectional view of the mortar detached. Fig. 8 is a fragmentary viewshowing in detail, in plan, and side elevations a portion of the stamp,the collar or tappet thereon, the stamp-head, the shoe, and the die.Fig. 9 is an interior elevation and a top plan view of one of thecircular screens. Fig. 10 is-a top or plan view of the circular topplate of the machine-frame. Fig. 11 is a similar view of the mortar, andFig. 12 is a similar view of the wheel shown in Fig. 6.

A is a mortar-block of any approved construction upon which the mortar Brests. In

this instance the block is provided with con ical vertical extension at,adapted to engage in a suitable recess or socket b in the mortar B.

E and F are circular plates,'the latter ar ranged at the top of themachine. These plates and the mortar B are secured in position by hollowstandards J, which restupon the mortar B and underneath the plate F, butwhich pass through suitable apertures in lugs e in the plate E. Bolts Jpass through the standards J to secure the parts together by means ofnuts j j at the top and bottom thereof, respectively. These standards Jare conveniently arranged, so that the three parts F, E, and Bconstitute the rigidly-secured frame of the machine. The lower portionof the mortar B is provided with a verticallyarranged flange 1), betweenwhich and the main portion there is thus formed an annular grooveprovided with a plurality of vertical recesses 29*, corresponding withthe number of dies'to be inserted.

B are dies provided with the usual lip or extension b the latter beingadapted to be inserted within the recesses or apertures b in the mortarB. In Fig. 11 these dies are shown in position. The inner wall of theannular die space or chamber 11 terminates in an up wardly-divergingwall or surface 19 that connects with a vertical wall I). At the upperportion of this vertical wall is an annular shelf b arranged for thepurpose hereinafter mentioned.

C is a wheel, Fig. 6, arranged to rest upon the upper portion of themortar B. Itsmeeting surface is provided with a downwardlyextendingflange 0, that engages with the surface 12 in the upper part of themortar. An annular groove b is made in this portion of the mortaradapted for the reception of the antifriction-balls 19 The interiordiameter of the flange c of the wheel is such as to nicely fit over oraround the exterior margin of the surface 12 in order that the surface 0will engage the antifrietion-balls 5 of the mortar, the flange servingto prevent access of dust or grit to the bearings. A vertical opening orbearing 0 in the wheel corresponds with a step-bearing b in the mortarand both are adapted for engagement with the shaft which operates thewheel 0. The wheel C is provided with an outer rim O,which is connectedwith the inner portion by radial ribs 0 that are broader at their basethan at their top, as clearly shown in Fig. 12, whereby spaces 0 areformed between said ribs, and whereby deposits above the wall may bepassed through without findinglodgement therein. The outer lower marginof the outer rim 0 of the Wheel is provided with an annularhorizontally-extending flange c D D are circularly-arranged lifting-camsadapted to rest on theirlower edges upon the flange c and at itsinterior diameter corresponds with the external diameter of the outerrim 0 of the wheel 0. The cams D may be secured to said outer rim byscrews 01 or by any other convenient means. D is the inclined or liftingcam-surface, and it will be noticed that said lifting-surface (see Fig.4) is inclined with respect to the vertical surface of the cam, as moreclearly shown at cl, Fig. 4. 7

Upon the upper plate F, mounted in suitable journal-bearings X X, is adriving-shaft I, to which motion may be communicated by the wheel S fromany suitable source of power. Upon the shaft 1 is a driving bevel-wheelII, which meshes with a driven wheel H, the latter being mounted abovethe plate F upon a vertically-arranged shaft G. The shaft G passesthrough a suitable aperture 9 in the plate F through the opening 0 inthe camring 0 and rests at its lower end in the stepbearing 1) in themortar B. Ring G is secured to the shaft G to rotate therewith by meansof a key g or by other suitable means.

Surrounding the shaft G at its lower end adjacent to the step-bearing bis a plurality of antifriction rollers or balls g which are held inposition by an annular ring or plate 9 secured to the mortar B byscrew-bolts g or other suitable means, the inner margin of the ring gbeing curved or cut away sufficiently to accommodate the balls 9Asimilar ring g is secured to the plate F by screw-bolts g or othersuitable means and serve as a means of securing the antifriction-balls gin position around the upper portion of the shaft G. By this simplearrangement I find that I am enabled to obtain a ball-bearing for theshaft G that is very inexpensive to construct, but which is veryefficient in operation. I find also that by providing the shaft G withsaid ball-bearings and by providing the cam-ring G with a ball-bearingupon the mortar B, as previously explained, I am enabled to do veryefficient and positive work with the cams D without having anyunnecessary torsional strain upon the shaft G.

Through the upper plate F and the lower plate E are a plurality ofvertically-arranged apertures, (lettered f and e, respectively) whichregister with each other and through which the respective stamp stems orrods K are reciprocated. Surrounding each of these openings is a ring f6 respectively, held in position by screw-boltsf a, respectively, andeach ring being curved or cut away at f c for the purpose of supportingor inclosing antifriction-roller balls f c, respectively,which lattersurround the stamp-stems K in a manner similar to the antifriction-ballswhich surround the driving shaft G, the difference, however, being thatin the latter case the balls g rot-ate upon their vertical axes becausethe shaft G has a rotary motion, while in the former case the balls f erotate upon their horizontal axes because of the vertical movement ofthe stamp-stems K, as well as upon their vertical axes.

Upon each stampstem K is secured a suitable collar or tappet L, beveledat its under side at Z to correspond with the inclination of thebearing-surface d of the cam I). The tappet L is adjustably secured uponthe stem K by a screw-bolt L or by other suitable means. Upon the lowerend of the stem K is the usual stamp-head M, and secured thereto is theusual shoe N. There will of course be arranged any convenient number ofstamps, each stamp comprising the stamp-stem K, the shoe N, and the dieB.

The forming of beveled surfaces Z and d of the tappet-collars and cam ona uniform inclination with respect to the central axis of the cam-'wheel is of great practicalimportance, as it affords a perfect bearingbetween said parts which will not be changed in the use of the machine,but will remain uniform. Another practical and important advantage ofthis construction is that the bearings between the tappet-collars andcam-wheel at the point at which the collar drops off the wheel is of thesame area and is capable of supporting the same weight as in other partsofthe wheel, so that the weight of the stamp and stem will not be thrownupon an unsupported and salient corner of the cam at the point at whichthe tappet-collar leaves the same, with the result of breaking away saidcorner, and thereby impairing the elficiency of the cam.

It will be obvious that upon rotation of the shaft G the several tappetswill be raised from their lowermost position-to wit, that shown in theright-hand portion of Fig. 2to their uppermost position-to wit, thatshown in the lefthand portion, Fig. 2and as soon as the highest portionof cam D passes a given tappet the die-stem K, to which that particulartappet is secured, will fall by gravity and crush between the shoe endand the die B any ore that has found lodgment upon the die B, thatparticular stem K remaining then in its lowermost position until the camD again moves around and raises it, when the operation is repeated. Inthe drawings for this specification I have illustrated sixteen of suchstamps, which are conveniently operated by two cams and which performthe work very promptly and efficiently.

I will describe the means for feeding the ore to the dies B and forremoving the crushed material from the die-chamber. It will be observedthat the lower plate E is provided with two vertically-arranged annularflanges E E the latter being the outermost flange. It is in the spacebetween these two flanges that the die-head and shoe reciprocate. Theinterior diameter of the inner annular flange E is such that when theplate E is positioned with respect to the mortar B an annular circularpassage-way E is afforded between said flange E and the upper verticalportion of the mortar B. The ore is delivered from the ore-crusher tothe interior of the rotating ring 0 and falls through the spaces 0between the ribs 0 upon the shoulder 19 of the mortar. From thisshoulder it is swept by rotating blades 0 secured to the ring 0 byscrew-bolts c or other suitable means, into the passage-way E fromwhence it falls into the die chamber or space b upon the dies B. Thelower outer margin-flange E is cut away, as shown at 6 and the uppersurface-flange b of the mortar is curved, as shown at a A series ofscreen-frames P, carrying screens 1), are arranged to fill the spacebetween the upper portion of the flange and the lower portion of theflange E the lower margin or edge 19 of each screen P resting in thegroove e and the upper margin 19 resting in the groove 6 of the flange Eand being thus held in position by a turn-button O, pivot-ally securedby a screw-bolt 0 or otherwise to the outer side of said flange E insuch position as to be turned down from the upper edge of said screensP, as more clearly seen in Fig.1, thus holding the. screen in position.The screen P is provided with two ofisets or shoulders at its ends 19 19one directed inwardly or to the conical side of the screen-frame and theother directed outwardly to the convex side of the frame, whereby itwill be apparent that the adjacent ends of such screens overlap eachother and which also tends to hold the screens in proper position. Asthe several stamps descend forcibly by their weight or gravity and fallupon the dies B the material is pulverized and stamped in the usualmanner and is scattered and forced outwardly through the screens P in afamiliar manner. Surgives a greater execution to the stamp when dropped.1 claim that this is a very important feature of my invention and adeparture from previous devices. When the ore is stamped, it passes outthrough the screens P in the usual manner, either wet or dry, as may bepreferred.

It will be noted that in the sixteen-stamp circular battery, such as areshown, two stamps are dropped atthe same time, one being directlyopposite to the other, by which construction I am able to strictlybalance the mill at all times, the stamps being dropped continuously andsuccessively one after the other upon opposite sides of the machine.This arrangement thoroughly distributes the ore in the die-chamber ofthe mortar, and requires no backlash, as is common in the old straightbattery or stamp-mill.

While I do not care to limit my invention to any particular speed, Ifind that very great efficiency can be obtained by imparting to thewheel 0 a speed of seventy revolutions per minute.

My machine is comparatively inexpensive to construct, easy to assemble,is not complicated to get out of order, is very efficient in operation,and is so compact that sixtyfour stamps may be provided in a room of thesize usually occupied by twenty of the old style of stamps.

What I claim as new, and desire to secure by Letters Patent, is asfollows:

1. In an annular stamp-mill, the combina tion with a mortar-frameprovided with a diechamber, a supporting-frame secured upon or adjacentto said mortar-frame, a plurality of stamps mounted to reciprocate insaid diechamber having stems which rotatively engage saidsupporting-frame, and tappet-collars on said stamp-stems, of acentrally-arranged wheel mounted to rotate on said mortar-frame providedwith a plurality of 'camsurfaces engaging the several tappet-collars ofsaid stamp-stems, the adjacent parts of the collars and cams beingprovided with beveled surfaces which are formed on a uniform inclinationwith respect to the vertical axis of IIO said wheel, and means forrotating said camwheel.

2. In an annular, central-feeding stampmill, the combination with amortar-frame provided with an annular die-chamber, and

stamps mounted to reciprocate therein, of a cam-wheel mounted to rotateon the upper surface of said mortar-frame and having ongagement withupwardly-extending stems secured to said stamps by means of which saidstamps are reciprocated, openings in said wheel through which ore maydrop upon said mortar-frame, means operated by said wheel to scrape theore from the frame to the diechamber and means for rotating said wheel.

3. In an annular central-feeding stampmill, the combination with amortar-frame provided with an annular die-chamber,stamps mounted toreciprocate therein and an annular ledge or shelf on said frame adjacentto the upper surface thereof, of a ca1nWhee1 mounted to rotate on theupper surface of said mortar-frame to operate said stamps,provided witha conical hub and a plurality of apertures through which ore may dropupon said annular ledge, plows mounted on said wheel and adapted toscrape the ore from said ledge to the diechambers, and means forrotating said cam-wheel.

4. Astamp-mill comprising a mortar provided near its upper end with anannular ledge or shelf and at its opposite end with an a1i= nulardie-chamber, a plurality of dies therein, a plurality of stamps mountedto coact with said dies, provided with Vertically-extending rotatablestems, a frame mounted on said mortar adapted to support and guide saidstamp-stems, tappet-surfaces on said stems, a cam-wheel rotativelymounted on said mortar the cam-surfaces of which have rolling contactwith said tappet-surfaces, apertures between the periphery of said Wheeland the hub thereof for the passage of ore therethrough upon the annularledge or shelf, a plurality of plows secured to said wheel and adaptedto scrape ore from said shelf,- and means for rotating said wheel.

In testimony that I claim the foregoing as my invention I aifix mysignature, in presence of two witnesses,this 11th day of August, A. D.1896.

FREDERICK L. PRESTON.

Witnesses:

TAYLOR E. BROWN, W. L. HALL.

